Which of the following could indicate that a chemical change has taken place?

gas formation

formation of a precipitate

color change

all of the above

Which element will attract electrons more strongly-fluorine or carbon?

In the combustion of ethane, what is/are the reactant (s) ? A. CO2 and H2O B. C2H6 and O2 C. O2 and H2O D. CO2 and C2H6

Even though the neighborhood shown by the green star was not next to any of these fires, how was the neighborhood affected by them? A) The heat generated by these fires made the temperatures in the surrounding areas increase.

Why do solids react faster in powder form than in lump form

Does a mirror breaks up light into all the colors of the rainbow

The total number of valence electrons in the phosphate ion is

The reaction below has an equilibrium constant kp=2.2*106 at 298 k. 2cof2 (g) ⇌co2 (g) + cf4 (g) calculate kp for the reaction below. cof2 (g) ⇌12co2 (g) + 12cf4 (g)

The electrical conductivities of the following 0.100 M solutions were measured in an apparatus that contained a light bulb as the indicator of conductivity. Rank the solutions in order of decreasing intensity (brightest to dimmest) of the light bulb.

What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?

Why is it harder for the earth to recover from some natural disasters now? A) Human influence may compound the damage. B) The natural disasters have gotten worse. C) This statement is not true.